Process instance stuck in gateway when restarted

RE: Process instance stuck in gateway when restarted

Aby Amores — Wed, 01 May 2019 22:12:13 GMT

I previously restarted the "Script Task" node and it got stuck again.

But I just tried to restart the "Dummy" node now and it went through!

(Restarting Dummy node)

I'm not sure I why this happened but it's good to know it finally got to the node I wanted.

Thanks a lot for your help, Dan! :)

RE: Process instance stuck in gateway when restarted

Dan Lluhi — Wed, 01 May 2019 22:00:49 GMT

That is my understanding. With the dummy node in place, which node was it that you started after the process instance completed the first time? The new "Dummy" script task?

Thanks,

Dan

RE: Process instance stuck in gateway when restarted

Aby Amores — Wed, 01 May 2019 21:54:18 GMT

Hi Dan,

Thanks for your response.

Interesting, so this means the first time the gateway is executed with only one incoming path but the second time it waits for all incoming paths?

If so, I tried adding a "Dummy" node before Gateway 2 to receive both inputs but I ran into the same problem again, the process is stuck in Gateway 2.

Any ideas?

Thanks,

Aby

RE: Process instance stuck in gateway when restarted

Dan Lluhi — Wed, 01 May 2019 21:24:31 GMT

Hi,

This is due to the fact that "Gateway 2" has two incoming flows. From the documentation on XOR gateways (https://docs.appian.com/suite/help/19.1/XOR_Node.html):

"When multiple incoming flows are connected to the XOR gateway, it allows the first flow token through to an exclusive outgoing flow. Subsequent flow tokens wait for all incoming flows to arrive before executing the output flow decision."

Hope this helps!

Dan